1D1P

CRYSTAL STRUCTURE OF A YEAST LOW MOLECULAR WEIGHT PROTEIN TYROSINE PHOSPHATASE (LTP1)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.169 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structures of a low-molecular weight protein tyrosine phosphatase from Saccharomyces cerevisiae and its complex with the substrate p-nitrophenyl phosphate.

Wang, S.Tabernero, L.Zhang, M.Harms, E.Van Etten, R.L.Stauffacher, C.V.

(2000) Biochemistry 39: 1903-1914

  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Low-molecular weight protein tyrosine phosphatases are virtually ubiquitous, which implies that they have important cellular functions. We present here the 2.2 A resolution X-ray crystallographic structure of wild-type LTP1, a low-molecular weight pr ...

    Low-molecular weight protein tyrosine phosphatases are virtually ubiquitous, which implies that they have important cellular functions. We present here the 2.2 A resolution X-ray crystallographic structure of wild-type LTP1, a low-molecular weight protein tyrosine phosphatase from Saccharomyces cerevisiae. We also present the structure of an inactive mutant substrate complex of LTP1 with p-nitrophenyl phosphate (pNPP) at a resolution of 1.7 A. The crystal structures of the wild-type protein and of the inactive mutant both have two molecules per asymmetric unit. The wild-type protein crystal was grown in HEPES buffer, a sulfonate anion that resembles the phosphate substrate, and a HEPES molecule was found with nearly full occupancy in the active site. Although the fold of LTP1 resembles that of its bovine counterpart BPTP, there are significant changes around the active site that explain differences in their kinetic behavior. In the crystal of the inactive mutant of LTP1, one molecule has a pNPP in the active site, while the other has a phosphate ion. The aromatic residues lining the walls of the active site cavity exhibit large relative movements between the two molecules. The phosphate groups present in the structures of the mutant protein bind more deeply in the active site (that is, closer to the position of nucleophilic cysteine side chain) than does the sulfonate group of the HEPES molecule in the wild-type structure. This further confirms the important role of the phosphate-binding loop in stabilizing the deep binding position of the phosphate group, thus helping to bring the phosphate close to the thiolate anion of nucleophilic cysteine, and facilitating the formation of the phosphoenzyme intermediate.


    Related Citations: 
    • Cloning and Characterization of a Saccharomyces cerevisiae Gene Encoding the Low Molecular Weight Protein-tyrosine Phosphatase
      Ostanin, K.,Pokalsky, C.,Wang, S.,Van Etten, R.L.
      (1995) J.Biol.Chem. 270: 18491


    Organizational Affiliation

    Departments of Chemistry and Biological Sciences, Purdue University, West Lafayette, Indiana 47907, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TYROSINE PHOSPHATASE
A, B
160Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: LTP1
EC: 3.1.3.48
Find proteins for P40347 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P40347
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EPE
Query on EPE

Download SDF File 
Download CCD File 
A, B
4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID
HEPES
C8 H18 N2 O4 S
JKMHFZQWWAIEOD-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
EPEKi: 250000 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.169 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 41.586α = 90.00
b = 67.647β = 90.00
c = 115.162γ = 90.00
Software Package:
Software NamePurpose
X-PLORrefinement
DENZOdata reduction
AMoREphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-03-08
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance